Datasets from Carbon Mapper portal finding there is a need for wider availability of site specific geospatial and time-resolved information (e.g., locations of gas collection wells and time-series of well downtime) to identify the methodological changes needed to better account for work face emissions in current emissions models. This dataset is associated with the following publication: Scarpelli, T.R., D.H. Cusworth, R.M. Duren, J. Kim, J. Heckler, G.P. Asner, E. Thoma, M.J. Krause, D. Heins, and S. Thorneloe. Investigating major sources of methane emissions at US landfills. ENVIRONMENTAL SCIENCE & TECHNOLOGY. American Chemical Society, Washington, DC, USA, 58(49): 21545–21556, (2024).